SEOUL (Yonhap) -- The following is a chronological review of major developments related to North Korea between Oct. 15-21, 2009.

October 15 A delegation of the North's Korean Physical Culture and Sports Guidance Commission, led by Chairman Pak Hak-son, leaves Pyongyang for a visit to China.

15 North Korea's Navy Command issues a statement accusing South Korea of repeatedly sending battleships into its western territorial waters in a deliberate attempt to raise tension and dampen thawing ties between the two Koreas.

16 Foreign Minister Pak Ui-chun sends a congratulatory message to Irina Gueorguieva Bokova upon her election as director-general of UNESCO at the 35th session of the agency's General Conference.

17 A delegation of the World Council of Churches, led by its General Secretary Samuel Kobia, and a visiting friendship group from the Chinese People's Liberation Army led by Lieut. General Gao Wusheng, arrive in Pyongyang.

17 A delegation from the North's Ministry of Land and Environmental Protection, led by vice minister Kim Kyong-jun, leaves Pyongyang for a visit to China.

17 The North's Korean Central News Agency (KCNA) says North Korean leader Kim Jong-il, together with servicepersons of the Korean People's Army (KPA), enjoyed a performance given by the visiting Academy Ensemble of the Interior Unit of the Russian Ministry of Interior.

17 A 2010 sports exchange protocol is signed in Beijing between the Physical Culture and Sports Guidance Commission of the North and China's General Administration of Sports.

18 The Vladivostok City delegation of the Russian Federation, led by Mayor Igor Pushkarev, flies into Pyongyang.

18 The KCNA says an unidentified delegate at the Oct. 12 meeting of the First Committee of the 64th UN General Assembly "demanded total and comprehensive elimination of nuclear weapons" throughout the world in a speech delivered during the gathering.

18 Yang Hyong Sop, vice president of the Presidium of the Supreme People's Assembly (SPA), meets with the Vladivostok City delegation of the Russian Federation at Mansudae Assembly Hall in Pyongyang.

19 Cabinet Premier Kim Yong-il sends a congratulatory message to George Papandreou on his appointment as prime minister of Greece.

19 Kim Yong-nam meets with a delegation from the World Council of Churches led by General Secretary Samuel Kobia at Mansudae Assembly Hall.

19 An agreement on establishing sister city relations between North Korea's Wonsan City and Russia's Vladivostok is signed in Wonsan.

20 Choe Thae-bok, secretary of the Workers' Party, meets with the delegation of the Workers' Party of Mexico headed by Leobardo Alcantara Martinez, director of the party training institution, at Mansudae Assembly Hall.

21 The KCNA says the North Korean embassy in Moscow arranged a reception on Oct. 13 to mark the 61st anniversary of the establishment of diplomatic ties between the two nations.